I can spin up a lightning daemon on one of my existing web servers quite quickly. And I could add bitcoind to it easily if it wasn't already on a particular machine. The barriers to entry are low. The cost on an existing server is negligible, but it can bring in revenue. It may be that this increases the number of bitcoin nodes because of this.
Whats the point of you being able to run a lightning node if no payments will be routed through it ?
Just because you can run a node doesn't mean it will be used. You will have to compete with the bigger hubs on fees and uptime.
The best lightning setup is with one central hub.