GrayR: Can't say that's happened to me very often, maybe once a long time ago when I bought a bow a bit heavier than I normally shot to hunt moose. I've been shooting sticks for a long time, and that's enabled me to know what bow weight is right for me. I also make it a practice to shoot other (heavier/lighter) bows whenever I have the opportunity, so I've always had a pretty good idea of what my preferred, maximum (and minimum) draw weights are. Several pounds one way or another from my preferred weight doesn't make much difference. However, as I age, I'm pushing 65 now, some of the bows that I ordered 10 or more years ago are becoming too heavy for me, but they weren't when I ordered them.
I don't think it's a good idea to order a bow heavier than one is comfortable with in the hopes that one will work up to it. Better to work up to it first, with a borrowed bow or a cheapie used bow. BTW, one can err on the side of ordering too light a bow as well.
Guess when it comes down to it, I'm suggesting that the longer one shoot sticks, the easier it becomes to order the draw weight that's the best fit.