Used cam openions???

What do y'all think about used cams?? My rule of thumb has always been to keep the lifters matched up with the lobes thay came off of... I've been finding some good used grinds lately that I'm really intrested in, but it seems that people can't seem to "keep the lifters with the cam"... What's the odds that a new set of lifters would work and last on a used cam???
I think you would be okay if you broke in the cam again with new lifters.....cam break-in additive and same time and rpm rules apply..