There are a few things to consider.
- If you end up with a lot of embryos, will you have trouble discarding or donating them after you are done having kids?
- There is less of a chance that an untested, abnormal embryo would implant, but it happens - and you'd have to make a decision about what to do if you didn't miscarry (so, if you would terminate for medical reasons)
- If you are a poor responder, you may not have many to test, depending on how many make it to day 5 or make it to blast
- Finally, there was a small study done by my wife's RI, Dr. Braverman, showing that not all "abnormal" embryos that are tested are actually abnormal
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5011996/
I don't think you're crazy to do PGS, but until you see how many embryos you get from your first retrieval, you may want to consider all options (you may end up needing to do more fresh transfers down the line)