“Build an advertising budget from inventory economics, qualified leads, sales capacity and measurable outcomes, not arbitrary platform splits.
Start with the unit economics
Before comparing platforms, understand what a successful transaction is worth to the business. For a developer, separate gross sales value from gross profit and marketing contribution. For a brokerage, start with expected net commission after sales costs, not the full property price. Then define the number of qualified opportunities the available inventory and team could realistically handle.
Without those numbers, a low cost per lead can be celebrated while acquisition is unprofitable, or an expensive qualified lead can be wrongly rejected because its potential contribution is misunderstood.
Build a transparent funnel model
Define enquiry, contacted lead, qualified lead, viewing and closed deal as separate stages. Use actual historical rates where available; otherwise label your assumptions as hypotheses and revisit them quickly. A simple scenario: 100 enquiries yield 30 qualified leads, 12 viewings and two sales. Those are illustrative numbers, not benchmarks or forecasts for any particular market.
Calculate cost per qualified lead and cost per viewing, then consider the time spent processing poor-fit enquiries. A platform comparison that ignores sales labour is incomplete.
Allocate by hypothesis and capacity
Reserve a controlled test budget for each channel with a defined purpose: Search captures expressed intent, vertical video creates discovery, and relationship-oriented media may support institutional demand. Do not apply one universal 40/30/30 split to every project. Different inventory, locations, brand awareness and creative capacity will change the right balance.
Protect a measurement and landing-page budget; buying more impressions cannot repair an untracked form or misleading property page. Add a stop condition before the test begins.
Distinguish ROAS from actual profitability
Reported return on ad spend can be misleading if it uses full property transaction value while ignoring cost of goods, commission, discounts, cancellations and time to close. Use a contribution-based view wherever possible and distinguish booked reservations from collected cash. Track attribution uncertainty: a long buying cycle involves search, referrals, site visits and sales conversations.
Build the dashboard with media spend, qualified pipeline, expected contribution and realized contribution on separate lines; do not show a guaranteed return when the evidence is only early-stage leads.
Decide what to scale every week
Hold a short weekly decision review. For each campaign ask whether lead quality is stable, sales follow-up is timely, the landing page matches the ad and inventory is still available. Keep a change log so you can tell whether results improved after a new video, pricing clarification or budget increase.
Scale only when the sales system can absorb it. Pause or repair campaigns that create the wrong expectations, and preserve a controlled test allowance for new creative. Better budgeting is an evidence habit, not a single spreadsheet completed at launch.
Official references and policy checks
Platform rules and available options change. Verify the current requirements before launch.