This is what is considered a 'super bye', which is full MoV and full SoS as compared to a normal bye one gets by being in last place in an event with an odd number of participants.
This bye is definitely worth using if you have it when you go to play in your Regional event.
I would not think it is worth buying one, however... honestly, if you are in a situation where you need to buy one, it is a little unlikely you are going to be able to take advantage of the purchase anyway.
Please tell me the exact line where this is written in the tournament rules, faq, etc.
I was in this position last year and I got a "bad" bye, which in a swiss-only tournament lost me valuable points. I would not use one of these byes again unless someone confirms that it's a 200pt win. The TO can't take my word for it, if it doesn't say so in the official rules it's a bad bye.
I haven't seen what the tourney kits say, but all I know is that at last year's regionals at the FFG Event Center that the people in my playgroup that had earned a store championship bye received a "super bye" as mentioned above. Maybe your TO had good reason, but it sounds like at least two mistakes were made there: Regionals shouldn't be a Swiss-only and you should have had a "Super" bye.
A bad bye under the SoS system (last year's regionals), especially in a Swiss only tournament, is definitely not an advantage (and would traditionally have gone to the lowest ranked player after a round).
Edited by AlexW