From my own experience I can only say that it seems like there are plenty of people who play bass just as there are plenty of people who play guitar. The difference is there are people who play bass and there are people who are bass PLAYERS. Everybody wants to play with a PLAYER. When you get in a situation where you are playing with PLAYERS you will know the difference quickly. I don't think there are as many great drummers (I should say I KNOW there are not a lot of great drummers out there!!

) as there seem to be guitatrists. I know quite a few really gifted guiatrists and keyboardists but I don't nearly as many really good bassists or drummers. I work all I want to and turn down things all the time so I can only attribute that to there being more of a demand than there is supply.
If you are good on bass AND drums you should be turning down work too!!
Peace,
T