I'm new to primitive and bow making (really new) but I'm not a stranger to heavyweight bows. I regularly shoot 70-85. 75 being my favorite weight. I had a 102 FG longbow I recently sold. It was fun while I owned it, but couldn't justify keeping it around as I didn't shoot it often enough.
When I first started shooting traditional, I started with 40lb bows. This was at the recommended advice of many. I used to think there was no way I could shoot over 60lbs. Then one day a friend showed up with a 70lb longbow and I said what the hay. I tried it and was surprised that I was able to handle it. It was all down hill for me then. You never know till you try, right?
I'm planning on parting with almost all my FB bows, to start the making process. I still need some more equipment to get up and running and I intend to make bows in the 30-100 range for fun. I figure if I'm capable of shooting these weights, then why not make them. I'm sure there will come a time when I cant. Untill then, I'm going to lean forward in the saddle and enjoy it for all its worth. I don't plan to do this to sell bows or make money., but if I had a friend ask for a 150lb recurve, sure I'll attempt it. But thats me. I like to try new things and challenge myself. The gentleman that asked for that bow will find someone to make it for him eventually. It's pretty cool to think that he had the confidence in you to make a bow for him in that weight. Not many people will make one that can handle it. I'd try it, but that's just me. I'd just want to see if I was capable of doing it. If I tried and didn't succeed, at least I'd know what I was capable of.
It's all about enjoyment.