When purchasing plants from the grocery store like that I would look closest at the roots. They are often watered way too much and sit in stagnant water until they either die or are bought, so the roots can be in pretty bad shape sometimes.
As for the spikes, you have to remember that they are probably primarily selling to customers who just want a nice bouquet of flowers and not necessarily a plant. Buying an orchid (with however many spikes) is probably cheaper than buying cut flowers and the flowers will possibly last over a month. So by this logic the more flowers the better and it doesn't really matter what the plant does after that since it probably won't make it anyways.
That said, I have a bunch from grocery stores myself and most are fine, just have to make sure you buy a healthy plant! And that you don't mind no-name-ville.