If it was possible to crossbreed tarantula species without the downsides i.e sterile, deformed etc and there was somehow a way to tell by looking what species it was crossed with so people couldn't cross breed two cheap species and produce an off spring that looks and acts like an expensive one, which two species would you cross breed.
Disclaimer: I'm not condoning cross breeding this is purely theoretical
Disclaimer: I'm not condoning cross breeding this is purely theoretical