I never base my technology purchases on the expected resale value. I buy computers based on the anticipated usefulness and value during my ownership of the product.
Sometimes I keep machines around so long that there is basically no substantial resale value.
It's an expense, not an investment. If you want an investment, go buy some Class B shares of Berkshire-Hathaway, SPY, or QQQ.
Hell, I drive a 15-year-old Toyota. When car shopping, I never thought about the resale value. I mostly cared about whether it A.) fit my daily needs, B.) was reliable, and C.) didn't cost too much to own (gas, tires, maintenance, insurance). When I do get a new car, I'll probably donate it to charity.
Buy what you think will fulfill your needs for whatever timeframe you expect to own the device. Forget about what you might (or might not) get back from the tired old carcass.