I would say that for me, deciding on what kits to make curbside depends on multiple things which a lot of the comments have stated to some degree or other. For example; if I have a 1970, and a 1971 Hemi Cuda, I will only build one of them as u full detailed kit. To me, if I have one really detailed example of each engine that I like, that's all I need.....the other cars with that engine will get the hoods glued down.....I wont even waste time, energy, and supplies on the top-end of the engine....off to the spare parts bin. What also decides for me about which kit gets to be curbside or not, was also mentioned earlier....dare I say it, I most definitely get burned-out doing super detailed builds. I can usually do two detailed builds back to back, then I need a break. It doesn't even bother me if its a rare, detailed, or expensive kit, if I don't wanna do the engine, i'll glue that hood down....done it many times before.