Since Solend uses Pyth and Switchboard, it needs a feed from one in order to list an asset.
You can suggest tokens for isolated pools in Solend Discord.
Why are fees a couple dollars?
TL;DR it's only expensive the first time you use Solend.
Solana state accounts need to be created to store state about your positions on Solend. Some SOL is required to make these accounts rent-exempt. These fees are only paid once, the first time you interact with Solend. Read more.
What is Nope?
Nope Finance is a project that Solend acquired in June. Nope Finance already had the NOPE token, so Solend offered a conversion to bring the Nope community into Solend's.
To summarize, visit a Serum DEX client (e.g. Bonfida) and manually add the SLND/NOPE market. The market ID is L48mQEKqj4f9BAcokgbB2vZ29w8X8HaYS3njco5JfRH. The conversion rate is 346.15038 NOPE to 1 SLND. Details of this announcement are here.