A few months ago I had a go at calculating the annual costs of the currently operating satellites. It doesn't factor in launch pad and other non-recurring and standing costs, but it does give an idea. I repeat it below:

• Currently ~3000 satellites at ~$250k each, and each lasting 5 years
• One Falcon 9 launches ~50 satellites, at a marginal launch cost of $15,000,000 (used booster + fairings)

So, total launch cost is:

• $250,000 * 50 + $15,000,000 = $27,500,000, or $550,000 per satellite
• The satellites last 5 years, so the per year cost is $110,000 per satellite

Thus, for all 3000 satellites, the current annual cost to build and launch is ~$330,000,000.

Of course, they're adding satellites, version 2 is coming out, Starship will reduce marginal launch costs by maybe an order of magnitude, ground operations and development costs are not included here, blah blah blah. Nevertheless, this might give a glimpse of the expense side.

Shotwell said they expect Starlink to become profitable this year. The Spacex launch cost for Starlink must be significantly less than what they charge for a flight to external clients, since they dont have the cost of dealing with the client, and taking their profit margin into account.