Why is this any different to if I ask my accountant/financial...

Why is this any different to if I ask my accountant/financial planner/lawyer for advice on my portfolio - all of which would clearly be tax-deductible? I suppose if they raise more than is needed, (I believe the intention is to donate any 'surplus' to a registered charity), then the nature of the tax claim partly converts to 'donation' rather than an 'investment deduction'...