Because that is the law. By law, legal charges must by calculated and explained by reference to ten criteria (not all of which will apply to any given legal service).
Those criteria are listed below. See item 7.
Some (many) solicitors offer a flat\fixed fee structure, but even so very few of them would charge the same flat fee for a €100k sale as they would charge for a €1m sale.
Auctioneers, Insurance Brokers, Stockbrokers and many others have a charging structure in which their charges are almost always explicitly linked to the value of the transaction. I cannot imagine that it is more difficult for a largely-automated trading process to put through a €1m share sale than, say, a €10k share sale.
I really don't understand why this bothers people so much more in the case of legal services than it does in the case of other services. Perhaps it doesn't - and it is just that I am unduly sensitive to criticism of solicitors. Perhaps there is a stockbroker out there with the same poorly-articulated sense of grievance.
CRITERIA BY REFERENCE TO WHICH LEGAL CHARGES MUST BE CALCULATED
- The complexity and novelty of the issues involved
- The skill or specialised knowledge applied
- The amount of time and labour reasonably spent
- The urgency attached by the client to the matter
- The place and circumstances in which the matter was transacted
- The number, importance and complexity of documents
- The amounts or values of money, property or an interest in property
- Whether or not there is an agreement to limit the liability of the solicitor
- Any research or investigative work undertaken and the time spent on it
- The use and costs of expert witnesses or other expertise.
https://www.askaboutmoney.com/threads/lpt-exemption.229255/
Based on previous posts by OP, maybe this was a file where the solicitor took the attitude that a relatively hefty fee was merited. But - friend or not - the solicitor should of course have issued the S.150 guidance.
When I have such a transaction ( as I sometimes do) my conversation with the client tends to be along the lines of "we have all suffered; I want some jam on my toast too". When a bit of jam is truly deserved, people mostly tend to agree that it is deserved.