You don't have to pay anything to use the wallet. You get the app, set up the node, open a channel to it and you're good. They say to send at least 100k if you are using the LSP so that you get the lowest possible fee when they open a channel for you.
I don't know exactly the prices for other LSPs, but I'm pretty sure all I've checked so far charge you a fee if they need to open the channel for you. That's part of the LSP business, they lock liquidity into a channel to your node so you are connected to a well connected node to reliably route your payments.