i believe in my opinion as long as the system is built brand new. There should be no errors, they have atleast about 2 and half year of using the pc before they can say "i've encountered a software error what should i do", and by that time they would be on forums like these(techpower).
I know it probably sounds unethical, but i leave those sorts of problems to be dealt with by error experts. Im a student, i do this for fun its not really my choice of business career.
Its soemthing i find fun and i do on the side, incase i need some pocket change or so.
I understand your point and i respect it. but occasionally some components are unfortunate enough shall we say to suffer a critical failure which means it needs to be RMA'd and you being being the guy who used your account to buy those parts and put it into the build are responsible for them for at least a year.
I made builds for people that have tested perfectly but then suffered a hard drive or PSU failure within 2 weeks or 6months and its my responsibility to fix it because i take pride in what i build, be it some £300 system or £100 system thats mainly made up of parts i pulled out of the trash.
Its alright if youre building a one off PC and sell it, but you are planning to make a small business out of it.
No warranty will seriously effect your sales and people will lowball you because theres no garantee that what you build will last 2-3years like you planned.
reguardless if you do it on the side or as a hobby. There are responsibilities and forfeiting those responsibilities leaves you liable to be taken to court and even sued for breaching the sale of goods act.
you are selling a brand new machine with brand new parts not a secondhand one. and there are rules/regulations that everyone needs to abide by when buying or selling goods. and it doesnt matter if youre selling on ebay, gumtree or any other internet site.
but i digress...If the price is cheap enough there are people that dont care about warranty because its cheap. but to make that possible it has to be stupidly cheap which means that you either operate at a loss or make enough for one or 2 pints at the pub at the end of the day and youre not gonna be happy with that are you?
Im not trying to argue with you, I do things differently and have a different opinion on the matter but thats just because ive been there and ive done it. Im just trying to impart some useful advice to you based on what i have learnt/experienced doing the same thing.