Allow me to rephrase that in a way that might be easier to comprehend. The opposite of disappointment is satisfaction, fulfillment or bliss. Everything you know and feel comes from contrast, so without experiencing disappointment, you cannot expect any satisfaction, fulfillment or bliss. In that case, why do anything if you aren't prepared to be disappointed? If you have no expectations, then you have no expectations that can be exceeded, either. Saying you can't be disappointed if you have no expectations is really saying you are expecting to waste your time, because you already expect nothing will come of your effort. If you have no expectations, why are you here? If you won't be disappointed if nothing ever comes of it, why are you here? You could get that result by not being here at all.
People write profiles because they have some expectation that what they have written will attract other people to meet them, so if you have no expectations, you wasted your time writing a profile. If you expecting your profile to attract at least one person and you are disappointed by the lack of success, disappointment will motivate you to improve your profile. When you expect nothing, you are really expecting to have no influence on anything that happens, no matter what you do.

