How fast do your characters advance? From just reading the rules, it looks like they would advance very quickly - maybe too quickly for my tastes. Coupled with the limited room for advancing in a skill, only six levels, do your characters top out after only a month or so of playing? Or does everyone become a jack of all trades?
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If I remember right, it takes 63 DP to get a skill from level 1 to level 6. That reduces to 60 if they started with level 1 in the skill at the beginning of game play. If you played sessions such that you had a major story every session and fulfilled every other DP reward example, you could get 10 DP per session. If you played once a week, you'd get a skill to 6 in a month and a half. I agree, that would be a bit fast, but to take an example from something like D&D, it would be playing all day and completing an entire module or story in that day's play. Back when we used to do that in second edition (when I was young and could afford to play 10-12 hours on a weekend day), we leveled 2 or 3 levels a session just because of the volume of play. In the same 6 weeks we'd have easily been level 12 to 15. Not max level, but still really powerful for AD&D characters. This is, of course, the unrealistic maximum example.
A more realistic example might be like, 6 DP per session. At that rate, if the player didn't spend a single DP on anything else, they'd get there in 10 weeks. Keep in mind though, that just purchasing one skill exclusively can make you a little less effective for things like, resisting damage or spells as you never raised your initial statistics. Kind of like a GURPS character with all 12's in stats but a 20 sword skill. He's deadly in a sword fight, but one sleep spell and he's out like a baby with a candy.
Also keeping in mind, most characters will drop a few DP for other skills just to help out. For instance, if you don't have a tracker or woodsy type to do it, most people will get tired of not being able to track the bad guy and drop a level or two in scout. Everyone, whether they have other skills or not, should probably drop a level or two in thief. Most adventurer types learn to sneak a little out of necessity. Those 6 and 9 points here and there whittle away at it pretty quickly.
The biggest thing is, for me, I still have a good time, even if I 'sprint' to lvl 6 in a skill. Also, as mentioned above about resist, skills aren't the be all end all of the game. Stats are important as well for all of the 'normal' stuff you do. Ignoring them can hurt you a lot.
I know I rambled a lot, but I hope that effectively (if long-windedly) answers your question.
What Neolithicwolf said. plus...
In my Tamriel game, we've had 11 game session. DPs earned ranged from 4-9 per session with and average around 6.
No one has a skill level of 6, nor is even close.
BBF lets you create a competent character that you can quickly get to the sweetspot, but then character development (statswise) slows down, dramatically so. The players are loving it. So am I.
I don't have to worry about frail noob characters who can't make a roll to save their lives and I don't have to worry about characters that can nuke the town. All good.
Play it a bunch. See if it is a problem before you go changing things. I'm betting you'll have a great gaming experience.
My son ran a little Dragon Age setting game for me and a friend of his. After many sessions, I sprinted my Spellcaster to lvl 6. He was not, by any stretch of the imagination, a total tough guy as I had not raised anything else. He was very good at casting, and it made some things easy, like travel, but again, that's really no worse than dealing with a 9th level magic user in AD&D with a teleport spell. The game did not at all cease to be fun and entertaining because of the skill.