Personally I just used every stat enhancement I got regardless of what else it raises or lowers. I wanted to perfect my physical stats first.
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That being said I hope the developers change the payment stuff for UFC 3 so that players cannot buy anything but moves, (punch, kick, clinch, grapple moves). Higher rated fighters can still be beat but it is a mental thing.
Then nobody can complain about having a high rated character based upon cash only. The moves do enhance abilities and they would still be a draw for people with extra cash to spend. However the building up of stats should primarily be bought by players playing the actual game.
This ought to releave some stress from the developers as well and won't have to worry about some guys who go cukoo and spend 1000 bucks on their team which can be upsetting for players wgo don't have the cash. Whereas being able to buy moves might still get a flow of cash but won't make the characters be rated 96 when everyone else is lower. Seeing the ratings is the problem. Let it be more behind the scenes so that players have to look at the moves.
However that said I haven't personally found that high rated characters beats skilled players anyway. (Although the stamina chin toughness etc seem really important) the rating of the chaacter isn't the most important thing. However losing to someone and then seeing there character is rated 10 or more points than yours might cause people to get cranky even if it was the player's skill not the actual character skill that made the most difference.
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