well, you would want to be honest when you resell them and point it out. i think it might hurt the value but i don't know. i only ever sold 2 on ebay and they sold really well, but they were pretty well scratched up. i only got 1/2 of what they were selling for at that time because of the scratches. i paid $3.00 and got $30.00. they were a pilgrim couple. unscratched ones were going at that time for $60.00. if you have rare ones you can make good money. i would start watching ebay and get a better idea.
if it was me, i wouldn't care if they're repainted, but i don't spend more than $5.00 depending on what they are.
in case you out grow them, get to many, or have duplicates
http://www.planetchristmas.com/Blowmolds.htm