So let me get this straight. If I buy 2 BJ machines for 11k
And it starts mining but I only earn back about 10k worth of BTC by the timeframe. Then hashfast will send me chips to enable me to get ROI. Well not exactly "ROI". Just break even only. So then I'll have to flop out a further 1-3k for boards/shipping/assembly to potential earn back the missing [11k-10k] 1k worth of BTC? So overall I would still be at loss given that scenario.

Oh does it take into account shipping costs as well? Because that's like 700usd or something?

We are trying to leverage our superior silicon design to benefit our customers, as much as possible.
In your example, we would give you enough ASICs to double the amount of additional hashing capacity that you would have needed - not just enough to break even.