What excess wear would towing a trailer with 500 pounds of tongue weight cause on a tow vehicle designed for 1,000 pounds of tongue weight?
More comfortable? Not unless something is wrong or out of balance.
Safer? The manufacturers know what is safe and state their requirements clearly. Hitches are not the way to cure an ill handling unbalanced trailer.
Cost? Not a factor at all. If you need one, you need one. If you think that any hitch is going to turn an underpowered undersprung tow vehicle into a super towing machine, you will be disappointed.
Read some of the many weight distributing threads on here and you will discover that no hitch is perfect and none will cure all towing problems.