I'd be fine with tomestones if it was more interesting. The only efficient way to farm tomes is expert roulette. Running the same 2 dungeons over and over is boring. More fun ways to grind tomes and I'd be ok with it. RNG can be unforgiving. In alexander normal, needed 1 more bolt last week to finish off my set. Rolled a 95 on my first run and lost. Rolled on 9 more bolts and didn't get anything higher than a 14. Then there's the 24 man raid option, but again, due RNG, the same item will drop over and over instead of a variety. Good chance you'll never see the item you want even drop.