That is completely based on your own view of money and value. To you $2000 or $147/mth may seem like a lot of money for what this software can do, because you KNOW you can build a better software. But what if you NEED a software that can do what SENuke does, and you don't know of any other way to get it?
To someone who can make thousands per month profit from what SENuke provides, doesn't the cost seem quite low in comparison? SENuke obviously wasn't designed for you, I don't think you understand that. SENuke was never meant to be sold to someone who has the ability to make something that performs better.
It isn't that any other prepackaged tool sucks more than SENuke, it is that their is NO tool out there that can be compared to SENuke that is available for purchase by the general public. SENuke is extremely user friendly and that is something that most other tools lack. Can you find me or tell me a tool that can do what SENuke can do that I can buy, which offers extreme user friendliness and all the features or more than SENuke does? Price is no object. Just find me something that even comes close to compare it to.
$147 is a lot of money to you and me for an SEO Tool, but for the majority of users, $147 per month isn't all that expensive. People pay hundreds per month for companies to post 1-2 tweets on Twitter and 1-2 Facebook status updates per week.