Personally for me. I don't want to get caught in the rat race. Probably says more about me, but the idea of always walking on eggshells, the fact it could end at any moment no matter how much effort I put Into it and the fact I regularly have to take phonecalls and disappear throughout the night. Dating just doesn't make sense when once a month or so I can splurge £70-200, get it out my system and move on
The only benefit of a partner imo is splitting bills, but again, if it ends, your left holding the bag and scrambling to pay the bills