I guess it's possible, but extremely unlikely, that I am just so cool that they want to give me a free copy to share with people, but I have legitimately never paid for local band's music. By this I mean a band member or representative will give me CDs or Download links all the time. Usually I stop by the table to grab a couple band stickers or a tshirt, and they ask if I want a CD (usually I don't, my live music preferences are much different than my recorded preferences but I still want to encourage their performing). When I decline, they just hand me one anyway and say here take it anyway. If I point out that I wouldn't listen to it, I prefer this music live, they say "give it to a friend".

Basically my point is, they won't decline the money, but they still want their name out there bad enough to make the trade-off. Particularly when it's download coupons rather than CDs (which have an up-front cost). Similarly all the recoding studios in my town are booked up solid, and the better dozen or so sound engineers are never hurting for work. (And this is a pretty small town, 200K pop in the greater metro area).