Bdsm is more about trust and control. Finding someone who doesn't leave marks, knows where and what to use. A punter is trusting someone to indulge their want for pain but only to the extent they wish.
Tie and tease and orgasm denial is more satisfying for basic sexual needs I suppose. Instead of coming in twenty minutes you get worked up to the point where the release is more intense.
Its fun to do on the domme side of things