JOEPRO
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- 4,735
- Location
- UK
Thinking of ways to compare or justitfy tool purchases - I presume we all do it yeah? 
Example - that £500 car scanner will pay for itself after a couple of repairs compared to going to a dealer.
Latest example and how my maths sometimes works out for the better I guess, at least in my head:
I bought another consaw tonight on fleabay. It owes me only £160.... in my workshop maths method.
So first I bought a TS420 on ebay listed with misspellings in the name (Still 420 instead of Stihl TS420) for £250. I was a bit overwhelmed as at that particular moment I had around 8 - 10 consaws. Oops. So I advertised it locally and it sold for £450. Buyer very happy too and that price was good for a nearly new saw that it was.
So I'm £200 up.
Then tonight I purchased a Stihl TS500i which is also the larger 14 inch saw but most powerful one and fuel injected for £330 as I won an auction on it. (Really worth £500 used) Shouldn't need anything it's listed as good used and full working order.
So in my head then I had £200 profit already and so the TS500i owes me £160. And at that rate I can therefore justify keeping it around even if I don't use it much. Make sense(?)
Make me feel better here and convince me this maths works. What examples do you have?

Example - that £500 car scanner will pay for itself after a couple of repairs compared to going to a dealer.
Latest example and how my maths sometimes works out for the better I guess, at least in my head:
I bought another consaw tonight on fleabay. It owes me only £160.... in my workshop maths method.
So first I bought a TS420 on ebay listed with misspellings in the name (Still 420 instead of Stihl TS420) for £250. I was a bit overwhelmed as at that particular moment I had around 8 - 10 consaws. Oops. So I advertised it locally and it sold for £450. Buyer very happy too and that price was good for a nearly new saw that it was.
So I'm £200 up.
Then tonight I purchased a Stihl TS500i which is also the larger 14 inch saw but most powerful one and fuel injected for £330 as I won an auction on it. (Really worth £500 used) Shouldn't need anything it's listed as good used and full working order.
So in my head then I had £200 profit already and so the TS500i owes me £160. And at that rate I can therefore justify keeping it around even if I don't use it much. Make sense(?)
Make me feel better here and convince me this maths works. What examples do you have?