Pinnacle Bosses....are pointless!

Go get 3 keys and fight a boss if you die you have to do it all again. I can buy the keys or the uniques from the trade center, If i do a citadel and get a key its better to just sell it for over half a divine then to keep it and do the boss bc you can just buy the unique for a divine. IM not incentivized to do the boss when i can buy everything. Please add checkpoints or portal points for each boss so i can learn the fight and have a better chance....