There's little argument that it's worthwhile to get high-end saw blades professionally sharpened, but a question that I've seen here before is if it's worthwhile for mid-tier blades. To find out I took the plunge and got four 10" Freud Diablo blades sharpened at Buffalo Dynamic. These blades retail in the $30-$40 range.
Shipping out to Buffalo was only $10 as I was able to use Priority Mail's Regional option. The cost of the service plus return shipping was $65:
Here is a sample blade; this 40T had lots of chipped teeth so it looks like they had to grind away material for clearance.
The one blade I've tried so far cuts great, just like new. To the touch they feel very sharp, too. So as I see it for $75 I got four new blades, not a bad deal. One can see how shipping needs to be carefully considered when doing the math on this.
Here is an imgur album with more photos: https://imgur.com/a/xuLs928