You used the term "unverified" twice in this post. The PayPal link is on a page hosted by the Colorado Timetable. That means the Colorado Timetable is behind it, just as LL Bean would be behind a link on a page they provide or Home Depot (a good FL company) would be behind a link on a page they provide. What would they have to do to convince you that it is for real?
You are certainly welcome to send lots of money through the mail (but can you guarantee that the mail won't be robbed?). This link is for those who would rather / cannot send a check (I have a number of younger colleagues who don't have a checkbook ... I think they are also the ones who don't have a landline either).