Matchday Mascots (stmirren.com)
Maybe a missed opportunity to raise cash.
As the link shows it is possible for more that one mascot,indeed have seen games with more than 2.
Seen some teams walk out with a mascot per player,so if demand is there,club could facilitate to meet that demand.
May be down to a lack of supervision of the kids if numbers too many or too much a hassle to make easy money and someone happy