Current Newegg pricing:
Windows 7 Home Premium Upgrade: $110
Windows 7 Home Premium OEM: $100
Difference of $10
Windows 7 Professional Upgrade: $176
Windows 7 Professional OEM: $140
Difference of $36
Windows 7 Ultimate Upgrade: $195
Windows 7 Ultimate OEM: $175
Difference of $20
So, if you want to go the OEM route where you shouldn't, well, "it is totally up to you. Good luck".
Oh, and a clean installation can be done with the upgrade media.
Please get your story straight. There is no mention of
retail prices in what you have posted above. Is there? You are talking about upgrades and OEM pricing not "retail". You want to deal with hassle of doing a clean install with upgrade version, that is your choice "good luck".
And for your information, if you do bother to read Microsoft System Builder License, this is what it says:
Authorized Distribution and Acceptance. To distribute the Software or Hardware in this Pack, you must be a System Builder
and accept this license. “System Builder” means an original equipment manufacturer, an assembler, a refurbisher, or a software
pre-installer that sells the Customer System(s) to a third party. You accept this license when you open this Pack. If you choose not
to accept this license, promptly return the unopened Pack to your distributor. You may only distribute unopened Packs within your
territory. For the territory in which you may distribute, see
www.microsoft.com/oem/sblicense/territory.
Hmmmm, I know for a fact that all computer technicians are considered "assemblers". Yes, I have checked into this through my attorney. You want to hear another funny thing? All you have to do is to replace one $0.2 piece of wire in the computer and guess what? WOOT, you are now an equipment manufacturer and you just got around the licensing crap.
This is totally Microsoft's confusing licensing crap and they have shot themselves in the foot for years now. This is why they have changed their licensing terms over and over for OEM versions. Just go and look online.
If you are worried about being nice to Microsoft, why don't you look at what they do illegally. I used to work for Microsoft Xbox support team. How long has Microsoft been selling Xbox with a known heat dissipation flaw (3 red rings)? Did they stop selling their faulty hardware? NO... Did they know about it? YES... Does it sound legal selling faulty crap to people?