Nope, Floyd --
Besides frames, I've bought many supplies at Michaels: papers/cardstocks, pens, pencils, markers. archival sleeves, matting and mounting tools and supplies, tapes and adhesives, portfolios (both the books and large and small valises), and countless other items. I even use several Liquitex products for printing and finishing digital work.
During their sales, Michael's is one of my primary local resources for digital and photography-related supplies.
'Paintings only' is their choice in this contest -- not a foregone conclusion based on their available inventory or customer base. That's fine -- totally their perogative.