I buy my bitcoins off coin base and as you know it takes a few days to arrive for use. A little over a week ago I bought 2 for 260 a coin and made my purchase when it was valued at 230 a coin. Anyways what I realized that what I thought I was spending 330 worth of product I actually spent 375 because of the depreciation. (including all fees and such) I know I don't have much control over the BTC market but now I will take that I to factor when I make my purchases
Tl;Dr buy low sell high
This is what pisses me off about Coinbase. (I'm also stuck going through them), and I believe it can be solved by adding a credit card to enable instant buys ( credit card acts as a fallback measure).