Have you been the owner since 1995? If so I would think you would have got offers to give you some idea.
If not I would have to say:
reseller $1,000-$3,500
Hobbyist $3,500-$8,000
End user $8,000-$25,000++
This name has many end users. Especially in sales. Who wouldn't want the A Team selling and marketing their stuff? And just the simple fact A can be the initial of Advanced, Attorney, Alaska, Arizona, America, American, Australia, .. etc.