That's a good point. Potential members should have similar goals to your current members. Otherwise, there can be issues.
I think it's also important, at least in a "gear treadmill" type of game, that potential members are comparably geared. If you invite under-geared people, the current member feels obligated to help them gear up for better power. It can create resentment. They've already done the work for their toons, so they don't want a constant stream of new people who need helping doing the same work over again.
Experience goes the same way. If you invite newbs into a dedicated team, you'll likely see some people get angry and some will even leave. They want to progress, not hold other people's hands.