Thanks for the kind words. I think we should relate this to the statement above. What is total cost of ownership after you factor in the first service? You previously mentioned that you paid $105 to service a single set. So if you paid $749 for the regs, then another $105 for service, after two years your cost of ownership is $854.
Out of curiosity, why would you not take advantage of the free service offer if it is available?
In buying regs, I would be more inclined to look at the cost of ownership over at least 5 years. Not just 2. If you gave free service for life, then 2 years versus 5 years probably wouldn't matter. But when you only give the first service for free, doing a cost analysis for 2 years is really going to skew the equation in your favor. I don't buy regs to be replaced every 2 years.
I would not get the free service because I'm now a DM for a shop and I'm pretty sure they'll service my regs for no charge.
Even if I were not a DM, I would be looking at $105 for a service versus some amount of money for shipping, the risk of shipping, the risk of needing post-service service, and the total time I would be without my regs. I don't know what the shipping and insurance would actually cost me, but there is a good chance I would just pay the $105 to have it done locally and know my regs would have no risk of getting lost, could be done and back in my hands more quickly, and I could take them back to the service tech easily if there was anything about the result that I wanted changed. The last time I had my DR regs serviced, there ended up being some problem with one of the parts (from a new service kit) that was installed. After a couple of uses, I was getting severe IP creep. I took them back and they fixed them (installed another new service kit) - quickly and for no charge.
A pure financial analysis would almost certainly be in favor of sending them off for the free service. But, if it only costs me an extra, say $50, to have it done at my local shop, then I view that extra $50 as ensuring that my regs won't get lost, ensuring convenience if I need post-service service, ensuring I get them back sooner, and lastly, giving support to my local shop, which I really want to be around for a while.
Regardless of the above, I plan to do like a lot of tech divers and learn to service my own regs as soon as I can. Once I do that, I will service my own regs.
So, a raft of potential reasons that anyone might not take advantage of the free service offer.