I see, we used to separate the test service for 15$ and upgrade service for 30$, and ppl mostly only order the test before.
Then it's hard for the client to pay more if we tell them that you are unlucky your watch failed the test and so. Under that case, we paid too much for this 'secretly ' upgrade so we decided to combine the service and replace sealing parts no matter what.
I just talked with the watchmaker, if we want to do 5bar, not only the price will be higher(need to rebuild some parts for different models), even after treatment there is still chance of exploding, the break point could be anywhere, once it explode, we may have to pay much more to get replaced parts and take a way longer time for that. The explosion will do no harm to the machine, but the client could lost a watch. I can already see the trouble coming
@WatchSmith.US did once on a GMT and it was really a disaster