> friendly, responsible, honest, not poor... keep the house clean
Even assuming I take you at your word, this describes a good roommate, not a good romantic partner.
> do sports, learn new things
Has negligible if any effect on romantic relationships. Both fat and stupid people still find romantic partners (and sometimes end up happy with them nonetheless).
> Then the fuck more you want
Somebody who is fun to be with, who makes me feel good, warm, and fuzzy inside, who at times makes me feel safe and at other times dares me to go farther. Somebody who is willing to go to new depths of vulnerability together, so that I can trust that they see me, the whole me, even the crummy parts, and I can see them, the whole them, even the crummy parts, and be loved and accepted nonetheless.
> The value of "a relationship" has dropped through the floor
This is transactional language. Strong, fulfilling romantic relationships are not transactional. Part of working on yourself is learning how to develop non-transactional relationships without getting hurt / getting exploited in your attempts to do so (i.e. by lemons on the market).
> more convenient to live single than to deal with the inconvenience of living with another person
I highly disagree, assuming that you find the right person to live with, which is the whole challenge. Living with another person who you enjoy living with, economically speaking, means splitting at least rent and electric bills (water bills are more linear with the number of people in the house), sometimes splitting a car payment (if you are a one-car household); when you split rent, you split the rent of the kitchen, the bathroom, the living room, and at least one bedroom, that are all shared. You eat better by cooking for two and sharing. The absolutely most economical arrangement is usually Dual-Income No Kids (DINK).