Again, no. You do not need to spend 10 million on a exploit if you are working with a company like NSO Group who sells white-glove access to target individual as a service. The cost lower bound is going to be on the order of ((cost of exploit) / (number of times exploit can be used)) and the denominator there is going to easily be in the hundreds to thousands. Of course prices are likely to be higher than the minimum due to profit margins.
To, once again, use the same example of NSO Group as it is infamous and well-documented [1]. In 2016 it was 500,000 $ upfront and 650,000 $/year for 10 devices. That article claims Saudi Arabia was monitoring 15,000 phones at a average cost of 10,000 $/phone. In [2] it was 7 million $ for 15 devices, but the upfront versus marginal cost per device is not broken down. And this was a relatively "above-board" company in the sense that they were a legitimate business entity with government deals which commands a premium relative to random unknown blackhat organization with no reputation.
And again, my original comment was discussing commercial profit-motivated attackers for which 1 million $ is easily within reach and just a cost of doing business to unlock greater amounts of profit. That is less than the cost of setting up a McDonalds. There is a vast, vast gap spanning factors of millions between Joe Schmo and commercial actors and a even vaster gap to state actors. There is no evidence that Lockdown mode is adequate against even commercial actors, let alone the vastly more capable state actors.
[1] https://prodefence.io/news/pegasus-spyware-operating-costs-c...
[2] https://www.reuters.com/business/media-telecom/meta-suit-aga...