symbolism of sonnet 87 by shakespeare

The sonnet really is a farewell to a fond friend or perhaps a lover. Many of Shakespeare's sonnets were dedicated to a "fair youth", perhaps the Earl of Southampton. Yes Shakespeare was considered by many to be bi-sexual if not homosexual. So, this sonnet is bidding "farewell" to somebody because the narrator feels rejected, ""thou art too dear for my possessing." There is the constant theme of "not being good enough" on the part of the narrator. There is some symbolism of financial bondage. Words like riches, worth and estimate are used with possession and loss.