Tbh a fluorescent green motorbike is not a requirement to function in a modern society and you're free/capable of respraying/had resprayed any other bikes panels, your analogy fails.
You as an individual do not matter to your bank, you're kidding yourself if you think otherwise, referring to the unequal dealings you have with a bank as a relationship is a misnomer.
Why does it have to be as an individual, customers are a collective body and they do matter. Some customers may matter more than others (and this shows in the type of relationship that is cultivated between the two parties) but keeping your customers happy is important in any business. Keeping the customer base happy, however, does not necessarily involve keeping every individual customer happy, or meeting every single one of an individual customer's demands/desires/requests.