Yeah, I got one last month I think and I had posted the results also. I got around 10 GT by playing the Level 2 wagering requirement. I am not sure if this is the same level every time they publish the flash promo but it was good man. It did give me a lot of sats and LTs too. If someone is getting it then do not miss it. The opportunity almost comes as a flash and goes as a flash.
You better have freebitcoin email checked all the time. For me it's a habit because I am a FUN premium member and I do not wish to miss any of the free WOF that lands in my mailbox. This has made me check every mail that free bitcoin sends me and I have strong reason to believe this is what made me go through that Flash Promo mail also.
Hope that every player on freebitcoin will receive it and also avail it for grand prizes.
How did you wager to tier 2 without losing your entire balance?
For reaching tier 2 you would have to wager 0.005 BTC. If you make many bets to reach this amount then you will likely end up losing an amount that corresponds to the house edge which is about 0.00025, which isn't too devastating. If you only make a few bets the results can be more volatile but if you use a low multiplier then you are more likely to have a positive result. The only time I've gone for the flash promo bonus I made fewer than 10 bets with a 1.01 multiplier and won all of them.