What I'm wondering about is the care and growth of the famous bonsai
tree.

How difficult is it? Is much "work" involved?

Is there a bonsai cherry tree? Do bonsais flower or bear fruit?

I've heard that wire is involved. Presumbly to inhibit or control growth,
correct?
If so, is it necessary to keep re-wiring the tree over time?

I've seen websites, some offer a bonsai for as little as $20 or $30, others
want $2000?
What's the difference here?