[count-your-change]

If I’m going to pay a nice chunk of money for something I’d like some assurance that it will work reliably and predictably.
Otherwise I get a box of junk and the blame for it’s failure.

[Moonman62]

I'd like something that can produce more than 4 watts (unsupported claim) after pumping hydrogen into it for several hours.

The following is a better value:

DIYer removes screen from TV to create death ray laser