I have heard that's how it is on the men's teams. On the women's side, hardly anyone wants to play singles lol. I tried USTA once & hated it but still, as a singles player only, get called repeatedly by captains I've never met to consider playing singles for their teams. I might actually consider USTA again if they split singles and doubles into 2 different leagues.
This reflects my own experience and feelings exactly. As a singles player, I tried USTA for the first time this summer and felt about it like Katie Holmes felt about Scientology, i. e., "Just get me out of here . . . "