There aren't actually many big financial processes where you need to sign scary declarations. Getting a 'wet signature' on a declaration is actually, when you think about it, a pretty bad sign. When you need to remind someone of how terrible the legal or financial consequences of something are, that suggests some other process may not be working too well.
To illustrate: after the initial scary declaration when I signed up to buy and sell shares online with my bank, I now do not need to do that. I know, and they know, that when I buy or sell some shares I am already aware of what that means.
So, given that I can process big trades without scary declarations now, if I am confronted with scary declarations I am thinking: gee, this really must be scary and big, or, why are they asking me for this? For consumers unfamiliar with the ways of financial services, signatures are even scarier - after all, most people don't know what the declaration they are signing means.