You are correct. I believe this is insightful as to the motives that move miners, still I think it would be awesome to have a prediction market making program like ErgoIntel to make transaction fees less needed, but I guess first people will probably use their GPUs for themselves in the markets for a couple of decades before a public prediction will emerge.
Anyway, I thought of another idea to create an infinite supply token used to perform high speed DB operations which is to be perpetually burnt whenever it is used\spent. This incentives miners by providing a fixed income in this secondary token. The inflation/deflation will be determined by the success of acquiring clients\companies to use this newly proposed feature, ErgoCache, I wrote about it here: https://www.reddit.com/r/ergonauts/comments/qpzzcl/kushtis_proposal_for_slower_emission_schedule/hk57m3b/