Its a difficult one this.
Accountancy services used by most sole traders are simply bookkeeping services and the accountant simply charges you a fee to fill in information you already have and know, its understandable why many resent paying for this.
However, a good accountancy firm one that holds chartered status, will often be well worth the extra money. They will have ways of helping to make your business much more profitable, and be able to make you plan ahead for unexpected tax issues. Plus they will be at the very forefront of latest tax legislation on employee matters and corporate matters.
For me, the firm i use, they are ex pricewaterhousecoopers and baker tilley accountants.
For me spending money on decent accountancy services is much more important than wasting money on pump controllers, super light poles with go faster stripes, and aqua doobies