I'm guessing because as he does the retals he'll just get fatter and fatter and then more ppl will just grab him. And with the building costs now, it's hard to grow your D if you're buying jets/grabbing huge acres/building up.

That retal on herbs12 will take him at lesat 31 turns to build up at 100 BPT (not counting 4 spy ops w/o failing, 3 turns to grab as a demo), but then he'd have to knock down bus/res bldgs and build those into labs to maximize TPT. That leaves him with about 7 turns to tech, 1 to sell tech - not enough revenue to do another big retal the next day. So he'd end up retalling every other day and hope no one else grabs him while he's uber fat.

It's a vicious cycle unless he beefs up D a LOT for two days first before doing retals.