So you've decided that you're going to use VDI for some of your desktops. Great!
Then you decide that you're going to pay for someone else to build and operate that VDI in their cloud environment. So now your paying for cloud desktops. (DaaS) Great!
Thanks to today's storage technologies, you can get fully persistent DaaS desktops for a decent price. This means you can easily replicate what your current desktop environment looks like in the cloud. Great!
Your current desktops have drives mapped to do storage. When they were on-premises, this was just regular network drives. But now that your desktops are going to be in your cloud, where will your file shares live? Will you map drives from your cloud desktops across the internet to your on-premises file servers? Hmm.. that doesn't make much sense. It's probably better to buy some file server services from your cloud provider. So now you're paying for cloud desktops and cloud file servers.
Of course, you're not moving all your desktops to the cloud, which means you need to keep operating your on-premises file servers and you need to figure out how to do some kind of file replication between your on premises servers and the file servers at your cloud provider. So now you're paying for cloud desktops and cloud file servers and replication services.
Now you think about your applications and the databases that run them. If you install those desktop applications on your cloud desktops, how will they perform when they connect to their databases running at your on premises location? Hmm, you either need to use XenApp to host the apps or buy database services from your cloud provider (along with replication software). So now you're paying for cloud desktops and cloud file servers and replication services and database software.
Okay, so how are your users going to login to their desktops? You already have Active Directory and all the users and groups and policies set up, so let's just extend that to the DaaS provider. (After all, you don't want your users to have to use a different username and password to authenticate to their cloud-based desktops, and you want to be able to manage those desktops with your existing management tools and methodologies.) So now you're paying for cloud desktops and cloud file servers and replication services and database software and Active Directory sync tools.
Hmm. There's a lot of IP in your cloud environment right now? What happens if your provider goes under? You better make sure you're getting regular backups of your environment. So now you're paying for cloud desktops and cloud file servers and replication services and database software and Active Directory sync tools and backup services.
But now you're done, right?