"well, that depends on..."

the problem is not only that you get a solution, but also to make that fit to your needs. So whether your own programmers do these modifications while using modules or other scripts or somebody elses ones do, you woun't get rid of the needs to add to it, to maintain it, to always develope it further.
There it seems to be a greta advantage to get an solution first that is open to these modifications. Well with perl it is. But these salesmen wan't to sell a product, ok sometimes also service, but thats a minority I guess.
And while selling a product doesn't imply do give out carbon copies of the construction plan I think thats with most other things as they change know, it's got to be approved that you can still can live from your work, even though in another way than just putting it to the shelf in the store. :-)

Have a nice day
All decision is left to your taste