You don't have to distill and your customers won't care, but over the long-term, serious side effects can induce from undistilled MDMA base contaminated with intermediates. These intermediates can alkylate your DNA and thus increase your risk for cancer. So, if you care for your health, you'll distill and sacrifice some yield. On the other hand, if your eye is on the dollar, just crystallize your product.
Btw, recrystallization cannot remove the impurities that a distillation can. For a pure product, you MUST start off with clean precursors, perform the A/B correctly, distill, and follow that by a few recrystallizations. Hope this helps.