Why don´t you just trade that bass for one unfinished one instead???
In my opinion the satin finish is a big +
I own one unfinished one and it´s getting really worn...And believe me it´s getting waxed and care all the time, it´s a 1991 so it´s not new anymore, For instance: where i place my thumb near the pickups there is a green hole appearing, the unfinished maple is just not strong enuff to withstand my slapping... sometimes i scratch under the strings when i slap so the bass is getting pretty beat up...But i kinda dig it.... And yeah is way darker now, she even get weird stains from places like clothing or the leather strap...so if you don´t care about this things go for it,I also have one Jazzman satin finish and it looks so much better even though it get much more abuse than my SS1