I get my draw pins from the local farm store. about $18 for 100 20g 1". Also get my syringes from them. Its cheap as hell. The rubber stopper dulls the pin a ton. So its smoother and creates less scar tissue for less than 20 cents a shot. No brainer.
Yeah, no risk as long as you wipe off the top of the stopper with some rubbing alcohol. I also like to wipe down the stopper after I draw too, it gets off any residue that might be there from the draw.