I have a lower household income than a lot of my friends, mostly because I'm a single mom and they're either dual-income or just higher earners than me. (I do very well vs. the median income in the US, but the DC area is richer than most!) We have playdates all the time with my richer friends. Doesn't bother me in the slightest. Yes, their $1M+ houses are bigger and nicer than mine. But mine's clean and stocked with toys, with plenty of play space, and we offer the same juiceboxes and snacks, and we're walking distance to a great park.
don't let insecurity about money get in the way of good friendships, OP. Chances are if the kids are young, the house will be relatively child-proofed anyway and expensive Ming Dynasty vases will be out-of-the-way and harder to break.
