(and final post for me) : it's not the first time we see using the "no data no fee" as an excuse if something goes wrong or they DO wrong because of lack of method or equipment to justify some further damage : "well, but I didn't ask you nothing for my attempts..."

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There are always exceptions, but beware. I have seen many drives completely messed up, because the owner asked 2 or 3 DR firms always on no data no fee basis (OBVIOUSLY, because serious DR firms DO charge much more if the drive has been already tampered...) without success (the problem was elsewhere), until had correct diagnose and repair.
As a note , I always charge for diagnose (with very few exceptions) and give report , it's not the end of the world. Some people like it, other dislike but this is not my problem.
Some words about low prices : we have discussed many times here : customers deserve EXACTLY what they whine or pay for. This has many implications , especially legal (one for all : AFTER agreement on price and the DR almost done the customer says "send me the drive back as is and I don't want to pay" ... what to do ? Both have legal binding, but if you take the case to court, who will be likely the winner? Unpredictable). I would suspect about very low prices as it is IMPOSSIBLE - because of tooling, equipment, taxes and so on - to have
such low prices.
There can always be exceptions.
It remembers me the story about a luxury car owner that wanted to change the complete tyres and wheels and was worried about the price... and then after a tour of all the garages he went to this obscure garage on the "wild side"

... oh yes, we can, 500$ for all ... and the guy started an endless asking and whining with the employee "but would be same quality of the original, but will you install them correctly, but will the car have the same performance, but..." until the boss came out and shouted "what the fuck do you want ? for 500$ everyone would know that these wheels are stolen !"