They literally make the rules...that's totally normal. 10k is the official price from the ministry, the Embassy adds fees for their work and use their own exchange rate. Average wordwide is about 14,000 Baht, but look at NZ... they charge 2,000 $, that's about 41,000 Baht... ;-)
It does... if you get arrested (whatever the reason may be) and your 90 day report is overdue, your fine for that goes up from 2k to 5k. Okay... that's the official version...
Why not? Drunk driving, drugs, street fighting, shoplifting, theft, domestic violance, and, and, and... pick one... many foreigners do many crazy things here... 😁
I saw that one got the visa with one (1) appointment, others with 2 or three appointments within some month, but not in Hanoi. So... your schedule should be actually more than good. But... it's never wrong to ask the Embassy. Bad thing with evisa now... if they reject your application your money is gone... that is different if you apply in person.