The point is that cost of maintenance/etc.. could be different between different solutions: let's say the customer is a Microsoft shop, with some internal .Net/SQL Server skills (or just licenses or external maintenance contract): choosing i.e. DotNetNuke could be more cost-effective than opting for a Wordpress/Drupal/other LAMP solution.
The same is true comparing OSS solutions too: say you have to compare two proposed OSS web solutions, one is running on the typical LAMP, the other one is FreeBSD/Erlang/PostgreSQL. They're both free and open, right? But if the customer has already some linux and/or mysql and/or php skill inside, the choice could be driven (also) by technical aspects.
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The point is that cost of maintenance/etc.. could be different between different solutions: let's say the customer is a Microsoft shop, with some internal .Net/SQL Server skills (or just licenses or external maintenance contract): choosing i.e. DotNetNuke could be more cost-effective than opting for a Wordpress/Drupal/other LAMP solution. The same is true comparing OSS solutions too: say you have to compare two proposed OSS web solutions, one is running on the typical LAMP, the other one is FreeBSD/Erlang/PostgreSQL. They're both free and open, right? But if the customer has already some linux and/or mysql and/or php skill inside, the choice could be driven (also) by technical aspects.