With this Bingo round, DT and the previous Arena tournament, it was a perfect storm for me. Starting with the Arena,I couldn't even battle since my dragons aren't levelled up enough (my strongest is a Fire level11) so consequently I couldn't even start DT. I turned to Bingo but the challenges were impossible since I didnt have a lot of the dragons needed to breed, and guess what--couldnt win the battles either.
I spend very little gold on these things since it seems like a lousy investment and only sucks me into spending more gold. It is REALLY chintzy of Storm8 to only allow gold and silver league players to accumulate tickets. So I've got these useless Bingo buildings on my islands and I would like the real estate to place more habitats.
Another sneaky result of this is, while I was playing Bingo I was actually harvesting far far less food than when I wasn't playing Bingo. Not spending more food, but growing less. That seems insidious but playing Bingo is a time waster, and time is better spent growing food since TPTB don't make food production easy.
In future I focus on the social aspect and far less on tournaments, DT and no more Bingo. What a useless distraction, but I'm glad I caught on early to the scam.