PLEASE, Take My Money!

Okay- First, an embarrassing admission:
I just bought another bike. That now makes seven, here, and there. Minus the tank bag and the bag on the pillion, it looks like that bike up there^.
Just over a year ago I brought the Suzuki SV650s to Phoenix and left it for me to use while here, and my son to use to commute to/from work. He has used "Roswell" MUCH more than I expected.

When we arrived this trip and I took Roswell out for a spin, it scared me.
My son IS NOT mechanically minded. The chain had obviously NOT been adjusted for quite some time. It was SO loose, I actually feared for my well-being.
And his. He admitted he wasn't comfortable with the mechanics of keeping the chain properly adjusted.
Oh boy.

I like shaft-driven bikes.
He NEEDS a shaft-driven bike.
He and I have both dropped Roswell on its right side due to "enthusiastic" use of the VERY powerful front brake at walking speed.
We BOTH could use a bike with a good anti-lock brake system. Long time readers know I've been looking at the Yamaha as a candidate.
The local dealer had a NEW 2014 Super Tenere ES on the showroom floor.  We've been nibbling at one another now for two weeks about the sale price on the bike. They came down over 3 grand. The hard bags and topcase on the bike cost over 2 grand by themselves.
I agreed to buy it.

I called and told them I wanted to send them a personal check from my online checking account and that I was willing to wait until those funds were safely in their account and had cleared before coming to pick the bike up.
"No can do!" was the response.
"We can only accept a Cashier's check, a 'Certified' check, or CASH as payment!"
Uhhhh..... WHAT?
"Let me repeat, to make sure you heard what I said" I replied...
"I'm willing to wait until you are certain that the check has cleared before I come get the bike."
And they repeated the above statement.

A cashier's check costs me $40.
My bank DOES NOT issue a "Certified" check. They issue what they call an "Official" check. It costs me $5, but takes a week to arrive at the dealership.
The dealer agreed to that arrangement.

So the question comes to mind:
What's the difference between receiving my personal check via mail, then waiting for the funds to clear? Reluctance to accept my personal check ALMOST made me walk away from this deal!
I pick the bike up in two days.

And now the sales pitch:
For sale-
One 1984 BMW R80RT in "Fair" condition.
One 1989 Honda GoldWing GL1500 Interstate in "Good" condition.
And one 1999 Honda Valkyrie Interstate in "Excellent" condition.
Call me. My number is BR549.