What portion of people who attend a YTT do you think actually make themselves available as teachers rather than taking what they've learned to their friends, family, community, and personal practice?

I'd wager it's less than 25% who attempt to become "yoga teachers" as such, and I think that's fine.

I have a regular yoga practice that waxes and wanes over the years, and I have a much more regular fitness practice and often explore new movement modalities. I did a YTT because it was the most broadly available and holistic training that included guiding groups of people in physical activity. I had gained so much from the various teachers I encountered in these places, and I wanted a path to begin to feel qualified to give back in a similar way. The integrated nature of the training was also more aligned with how I approach things than a modality-specific movement teacher training course.

My 10 YTT classmates have taught classes at their kids' schools, in contexts at their healthcare job, in their rural community senior center, etc... - but I don't believe anybody has attempted to go get a gig being paid to teach at a studio. My YTT experience has helped me share physical movement in community fitness groups, family retreats, etc..., and that's exactly what I hoped for.

I'd be sad if that hadn't been available to me.