As for the new issues, I fully stand by Sebi, Laura, and the third member of the Deckbox team. I will continue to use the website and will continue uploading cards to expand my tradelist. Deckbox has grown and its users have demanded more. The Deckbox team ('team') as a result has had to increase their time spent on the website. As things have progressed the 'breaking point' between work and deckbox collided. The 'team' believes that Deckbox is their passion. They are willing to gamble on Deckbox rather than what their previous lives where. Deckbox needs to become sustainable, most likely at a reduced income from their current employment (hence a gamble). I fully agree that ads are unsustainable as are donations. Ads cause more harm in the long run. Donations are pleasant but unreliable. The 'team' seeks reliability.
I believe that the 'team' could get enough data collected for its marketplace to create a smooth transition from TCG to its own data. I have no doubts that they tried to delay and hold off TCG for as long as they could. Their marketplace data is about a month away.
As for the viability and necessity of the marketplace - it is essential for the future of deckbox. No other source would provide the 'team' with the timemoney to continue to meet the demand from its users and WoTCs' new products. I believe that the switch to Amazon pricing was a result of a quick (i.e. immediate) patch while they pursue other means of getting an acceptable or best answer API key from another location. I believe they are pursuing another API key to replace TCG and the current Amazon. They will use the key and implement it as soon as they are able. They are also still collecting data points for the marketplace and will switch over from the API key to the marketplace in a far smoother and gradual tone.
The reactions and egress of some were and are unavoidable. Much like every sport team, there are observers, casual fans, committed fans, and fanatics. In good times everybody is a fan of the team and goes to games (creating a spike), in bad times there is a lull. While observers are appreciated and often most vocal when things go bad (in a negative way) they are always the first to leave and the last to join. They are around for the fame but once you've gone from grace, gotten old, and are sick suddenly they never answer the phone when you need help. (This is not a bad thing, it just is. Everybody has done this before and will do it again. I do not deride anybody for feeling or being this way.) Things on deckbox will not be as quick and easy as before. I, however, believe in the 'team' and am able to ride out this month long wait. I will also still conduct trading do to my belief in the 'team'.
For those thinking about going inactive while the problems are being addressed I would like to recommend using the next month as a test of your MTG card price acumen. Believe in yourself to accurately price cards. You play magic, have played magic, you have seen what people are looking for, trade for, and most importantly use in decks. Use that information to adjudicate a price with your knowledge and expertise. Pit that value on the value of other cards using your expertise. I have faith that you will come to a reasonable value eventually in your trades.