Usually not before its own records have been assembled. The version history, training rosters and audit references already inside a regulated laboratory are more persuasive than a purchased opinion. Government fees are set by the USCIS fee schedule (G-1055) and are unaffected by how much evidence is attached.
Spend on collection first, opinions last
The petition's cost has three parts: government fees from the fee schedule, including the I-129 fee, the fraud prevention and detection fee, any asylum program fee applicable to the petitioner and optional premium processing; professional fees for drafting and reviewing; and evidence costs. Evidence costs should start at zero, because the deciding records already exist in the document control system and the training database. An external expert letter is occasionally useful when the examiner has questioned whether the knowledge is truly specialized, but a first-filing opinion from someone who has never seen the protocol adds little.
If money is to be spent, spend it on a clear, well-organized internal description and on redaction that preserves confidentiality. Keep family application costs, relocation and any state registration for the spouse's practice in a separate budget so they are not confused with the petition.