Yes, there is a big difference, and I guess as long as the scam teams still keep enough fans to keep making money, there's no incentive for their GMs to change their M.O.
There's another (bigger) subset of owners and GMs who make enough moves to tease their fans and give the appearance they will be competitive or semi-competitive, at least every now and then, but they never will do what it takes to create a top 4 team, on paper. Every now and then, a small market team surprise everyone, but they never have the "best team on paper" the years they win or make it to the WS.
I'm not saying it was all luck; some small market teams like Oakland, KC and TB are very well managed and find unconventional ways to win, but it is rare for a team like the Astros to strategically tank as part of a plan to build a championship.