Or am I completely wrong on that one
Yes!
You cant just hire someone out of flight school. The airline has sort out safety, crm, typerating, base training, line training etc. That all costs ~£50K
Where as experienced pilots already typerated only have to do a short sim course for sompany SOPs. So whilst an experienced pilot costs maybe 10K more in salary, they are far cheaper in training and far less risk (as student could fail all mentioned courses above = £££££)