the real reason pros and magazines stress respooling is to sell line.

You're partly right and partly wrong.

Yeah, pros want their sponsor's line to get sold. Magazines want their
advertisers to sell line.

Pros on the other hand, MUST get every bite in the boat they can. They CANNOT
afford ot lose a fish. One lost fish could cost 10's of thousands of dollars
and a trip to a championship or to another circuit. They usually do not pay
for line or pay full price, so they can afford to change line every day. Why
lose fish to bad line when there is no reason not to?

I'm far from a pro. I have 14 rods I use all the time. I fish one or two club
tourneys each month during our season. I respool rods before each and every
tourney, but not in between. I use three sizes of line, 6 on spinning, 10 for
cranks/topwaters and 15 on everything else. I buy a small bulk spool of 6 and
a large bulk spool of 10 and 15 each year. I spend about $65.00 a year on
line. Not a bank breaker by any means.

Brad