It's been mention at least 10 times previously in this thread... the first time was on page 2 (post 49).
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Wow... $30 for search utility... and some bagged on me for mentioning a $15 menu bar manager utility.
There are many ways to look at product pricing.
One way is to look at the cost of manufacturing. In the case of software, this is mostly the time and effort required to develop the software as well as the effort put into customer support. From that perspective, $30 for HoudahSpot is on the cheap side. At $15 Bartender is probably also is rather cheap by this standard.
What really matters to you, as a buyer, however is how much benefit you get out of the product. That is ultimately up to you to determine. Some customers use HoudahSpot every day. Others turn to it only now and then when everything else fails. Others download the demo and find it does not help any or does not fit their workflow.
In a second step you also need to evaluate how much money that benefit is worth to you. Minutes saved every day. An hour saved here and there. How much is that worth?
I can only encourage you to download the demo. Check out the documentation as well as the Tips & Tricks blog to see what HoudahSpot can do for you.