Those figures assume that the miners other than yourself are honest. The big risk with MEV is that in theory it could trigger all miners to prioritize reorging (51% attack) instead of building on the longest chain.
This is a really interesting point, and an issue that Bitcoin will likely run into as the block reward nears zero, and transaction fees provide the majority of the miner revenue. Miners could be incentivized to reorg blocks in order to get transaction fees.
