Net spend is a function of both sales plus purchases, though. As such, it is attached to the value you are able to create around the players you can sell, as much as the players you can buy. Expenditure, though, tells us how much you can actually afford to spend. To suggest we haven't spent a lot of money simply because of low net spend, is not really accurate - we've spent large sums of money on a defender and a goalkeeper. And those two players have helped us to finish close second in the league, and win a Champions League trophy. I don't think it's inaccurate for other supporters to recognise that. It's the way of the football world - if you can't recruit talent early or on the cheap with som luck, then you're going to have to pay the high price for it, and only a few clubs can afford to do that.
But the argument from rivals (which the poster stated) is that we're just spending our way to success, which isn't the true picture. We could only afford to spend because we generated income - not because we could just spend whatever we wanted.
If I have to sell my £250,000 house to buy a bigger and better £500,000 house, I can't simply be accused of spending £500,000, as I've sold to buy. I've actually 'spent' £250,000 on the new asset in terms of net spend. City, Chelsea, Utd and others just keep the £250,000 house and go out and buy several £500,000 houses.
The Coutinho money plus Champions league run in 2017/18 were worth over £200m (£140m of which directly or indirectly funded VVD and Alisson), leaving enough to even cover a Keita or Fabinho. We therefore developed an £8m player to such a level that we were able to sell him and buy two players who are now the world's best in their positions. That's the polar opposite of City's approach and indeed of Chelsea, Utd, and even Arsenal now.
We've therefore not just blown a load of cash to buy success, but have taken the opportunity to strengthen in key areas following the sale of a key player and an impressive run in Europe's best competition. The fact that we didn't spend all the money on a replacement for him is a sign of a club run well, and any competitive advantage we have gained is largely due to our exemplary transfer dealings under Klopp and Edwards rather than pure spending power alone.
Its not inaccurate for other supporters to highlight our spending but it should be in context, and its completely inaccurate to even put us in the same bracket as City, Utd or Chelsea.