Two things - one, you don't get a player till next year, so you're a year "behind" on that player's development, and have a hole this year that still needs to be filled. (Liken it to lending someone $10, and either getting it back next week or next year); and two, the value of next year's pick is variable - sure, you could luck out and get a high pick, but you're helping that team get better so are lessening that chance. That risk is what lessens the value.
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